Calories (Cal for short) are defined as the heat required to raise 1 gram of water to 1 degree Celsius at 1 atmospheric pressure; Calorie is an energy unit, which is still widely used in nutrition measurement and fitness manual. The international standard unit of energy is joule. As the legal unit of food calories, joules are widely used in Europe, while calories are used in the United States.

The total calorie intake of a normal person should be 2000 calories a day, and people who exercise can increase it appropriately. The following table lists the daily intake of various ingredients and their calorie ratios: (Among them, each gram of fat contains 9 calories; Each gram of carbohydrate contains 4 calories; Protein contains 4 calories per gram).

Resource link: Baidu Encyclopedia _ Calories